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Spark plug question
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<blockquote data-quote="Mike Redmond" data-source="post: 423000" data-attributes="member: 1197"><p>Tinkering around that new to me 1970 20 hp johnson,want to replace plugs,it has a set of QL77JC4 on it,been looking on the net what were the originals ans I get was J4C another says RJ8C ????getting confused?seems to be a mark on top of the pistons when I shine a light in the hole are them QL77JC4 the wrong plug or are they the replacement for the J4C ...can someone tell me what is the diff.between them</p></blockquote><p></p>
[QUOTE="Mike Redmond, post: 423000, member: 1197"] Tinkering around that new to me 1970 20 hp johnson,want to replace plugs,it has a set of QL77JC4 on it,been looking on the net what were the originals ans I get was J4C another says RJ8C ????getting confused?seems to be a mark on top of the pistons when I shine a light in the hole are them QL77JC4 the wrong plug or are they the replacement for the J4C ...can someone tell me what is the diff.between them [/QUOTE]
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